The Button Box closed retail operations, but Bob Snope still does repair work. Check the ButtonBox web site.
CNet's own Greg Jowaisis also performs repairs, I believe.
This pdf shows all the Crane layouts. Saguaro's Crane should match. Remember, YMMV.
http://www.concertina.com/crane-duet/Wilton-Bulstrode-Crane-Tutor.pdf